Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cedf04462fb38a5…

MALICIOUS

PDF

87.6 KB Created: 2021-08-14 00:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2977170c2fbf952168a1ea8acbc642b9 SHA-1: d677eb2310916a906b4a7fbf8f4a5a92fe886684 SHA-256: 9cedf04462fb38a5cd9e0128814fd28f8c716c5ec6625810b064ffa21cdb0f2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. These links are likely intended for phishing or to serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607749229ef86---26581431838.pdf In PDF document text
    • http://levakov132.ru/userfiles/file/44838857265.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c70a964e74---26835324492.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953de2d32f1---65337630151.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb40bace47f---rubowevixemem.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210611_DB8B3CA29E112B4F.pdfIn PDF document text
    • http://learningkey.org/userfiles/bokika.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/jupetikiretozoziv.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/91834264272.pdfIn PDF document text
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/pezolerinurapupe.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/sowujubamejive.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/jenivanikaxibunijusisaxe.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/471d233a03716ea2a2b663d8f7a2c630/dawifisigilegujovib.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/loveritogugom.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084913a5b1b9---67833676059.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8de7f5bf963f75c20f5d7a5dff2a8ced/74767507025.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9ccf6c796c9241fb095a21a9d59a4aaa/rajipugabatuw.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c2ac37255---97163692026.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/mikilozenexapif.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161137cb1f18cb---76822568536.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/a8q8q8jffnpddms0t27prokeek/posejumuvutonaxupeseten.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0edfac5f4d093e74f8477ae591de1a53/94700761143.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/vaxuxowewavatakilusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=find+mobile+number+free+ukPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 17128 bytes
SHA-256: e5866194479e5d580a0fe5e40b464487c6a3de05277d8210d08c19c6b20a9759
font_01_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 10396 bytes
SHA-256: c915d685b4672d89117d3084cac611d8fbf9df17939efd422af5a9c2a20dfbb1
font_02_sfnt_off00013860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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